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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-31411] Decide if non-sharded RS should do a noop write</title>
                <link>https://jira.mongodb.org/browse/SERVER-31411</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently non-sharded RS will not do a noop write. &lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.13/src/mongo/db/read_concern.cpp#L83-L86&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.5.13/src/mongo/db/read_concern.cpp#L83-L86&lt;/a&gt;&lt;br/&gt;
RS it the only source of clusterTime it will always get it once its replicated.&lt;/p&gt;

&lt;p&gt;However it leaves the scenario where  primary steps down after performing the write which returns to a client an operationTime X and the follow up request with afterClusterTime:X to a secondary will hang.&lt;br/&gt;
If secondary do the noop write it will avoid the hang&lt;br/&gt;
However in this case it will not get the data written to the primary anyways. Hence the query may return a non causally consistent result.&lt;br/&gt;
It differs from the scenario where shard1 returns operationTime X and then client issues a read to a shard2 with afterClusterTime:X and forces shard2 do a noop write if its clusterTime is &amp;lt; X&lt;/p&gt;
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                <environment></environment>
        <key id="441143">SERVER-31411</key>
            <summary>Decide if non-sharded RS should do a noop write</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-cluster-scalability">Backlog - Cluster Scalability</assignee>
                                    <reporter username="misha.tyulenev@mongodb.com">Misha Tyulenev</reporter>
                        <labels>
                            <label>LamontN</label>
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                <created>Thu, 5 Oct 2017 16:13:37 +0000</created>
                <updated>Tue, 12 Dec 2023 15:46:51 +0000</updated>
                                                            <fixVersion>4.3 Desired</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2354346" author="misha.tyulenev" created="Thu, 1 Aug 2019 15:13:38 +0000"  >&lt;p&gt;Marking as desired hence it existed since 3.6 and does not appear to be hit by a customer.&lt;/p&gt;</comment>
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